Photo-film clip



L. F. McKELVEY AND J. A. BRANDENBURGER.

PHOTO FILM CLIP.

APPLICATION FILED JAN-3.1921.

Patented Oct. 4, l921 f/ yi.

LILILJULIULILILJ UNITED STATES PATENT OFFICE.

i J LOUIS I. IOKELVEY AND JOHN A. BRANDENBUBGER, OF INDIANAPOLIS, INDIANA.

rnoro-rrnm our.

Specification of Letters Patent.

Patented Oct. 4, 1921.

Application filed January 8, 1921. Serial No. 484,473.

a s ecification.

t is the object of our invention to produce a photo-film clip which will hold a photo film securely against slipping even when the film is wet or under tension, but

which will not stick to the film with danger of tearing it.

The present invention is in some aspects a development and improvement on that shown in our Patent No. 1,329,422, granted Feb. 3, 1920. The accompanying drawing illustrates ou invention. Figure- 1 is an elevation of a. photo-film carrier equipped with photo-film clips of our invention, showing the carrier supporting a plurality of films spaced apart by the abutting of the clips; Fig. 2 1s a perspective View of a photo-film clip embodying our invention; and Fig. 3 is an enlarged section on the line 3-3 of Fig. 2, showing a portion of a film in place in the cli gur photo-film clip has a spring carrying member 10, which is made of spring sheet metal and is folded on itself to provide a loop, with the free ends crossing, one free end being bifurcated to provide a pair of fingers 11 and the other being provided near the end with lateral notches 12 for permit ting the passage of such fingers, the latter, end having a single finger 13 opposing such pair of fingers. Two sheet-metal plates 14 and 15 are fastened to the adjacent-faces of the fingers 11 and of the finger 13 respectively in any suitable manner, as by riveting, brazing, or soldering. These plates 14 and 15 form the jaws of the clip, and preferably are of considerable length, projecting on both sides of the fingers 11 and 13. These jaws differ from those shown in ouraforesaid Patent No. 1,329,422, in that they are curved instead of flat, with their convex surfaces toward each other, so that they meet only on an intermediate lon itudinal line of such convex surfaces instea of meeting on flat surfaces as in our aforesaid patent. By reason of this curved construction, the jaws 14 and 15, when they grasp a film 19, engage such film only on a line instead of on a com- 'paratively extended surface, and so provide no opportunity for the film to stickto the jaws, thus eliminating the liability of tearmg the film when removing it from the clip.

One of the jaws, say 14, is provided on its face toward the other jaw with a plurality of pro ecting pins 16; and said other jaw, here 15, is provided with a similar number of holes 17 which register with the pins 16.

The pins 16 are suitably fastened totheir supporting jaw 15, as by being riveted thereto. Each of these pins is preferably pointed; but the taper leading to the point does not extend all the way to the face of the supporting jaw 15, but stops short thereof, to provide an untapered surface 18 at least as long as the thickness of the photographic film. The line of the pins 16 and holes 17 is preferably coincident with the line on which the adjacent convex surfaces of the jaws 14 and 15 engage each other.

The spring of the carrying member 10 tends to move the jaws 14 and 15 together;

and when the film 19 is pressed between such jaws this spring tends to move .such jaws into engagement with the film on the aforesaid line along the jaws and forces the pins 17 through the film to perforate it. Of course, this will be done near the end of the film, where the perforation will not do harm.

The tapered partsofthe'pin's 16 pass com-- pletely through the film and force the film on to the ta ered parts of the pins. As a result, a pul on the film 19 acts on the untapered surface 18, which thus form shoulders perpendicular to the pull so that there is no tendency tospread apart the jaws 14 and 15 by the reaction of the film on the jaws, and the film is held firmly in place although engaging the jaws only along a line on each face. Thus the. film is firmly held, even though it is wet, as it is durin development and washing, and even thoug it is subjected to considerable tension to keep it straight.

In operation, a film to be developed has its two ends fastened in two clips of our invention, which clips perforate. the film as they grip it. The two clips may be suitably mounted in a photo-film carrier 21, shown in our Patent No. 1,323,369, granted Sept. 18, 1919, the clip atone end of the film being mounted on an upper cross rod 20 of the carrier, while the clip at the other end of the film is suitably attached to one of a series of vertically slidable weight rods 23 carried by a vertically adjustable lower cross rod 24 of said film carrier, so that the wei ht of the weight rod 23 tends to hold the fi m 19 taut so that such film will not come in contact with its neighborin films in the film carrier, When it is deslred to remove a film, which is usually not until after the completion of the entire development process, the two arms of each clip associated therewith are pressed together, to separate the jaws l4 and 15 and thus allow the film 19 to be withdrawn, which can readily be done without danger of tearing the film because the engagement of the film with the jaws on a mereline prevents their sticking to ther.

e claim as our invention: 1. A photo-film clip, comprising a sprin carrying member, two jaws carried by sai member and spring-pressed toward each other thereby, said two jaws being curved" with their convex sides toward each other so that they engage substantially along a line,- said two jaws being provided with one or more registering pins and holes arranged on such line of en agement.

2. A pho'tolm clip, comprising a sprin carrying member, two jaws carried by sai member and spring-pressed toward each other thereby, the face of said jaws toward each other being arranged so that the jaws engage each other substantially along a line and-flare apart on opposite sides of such line, said two jaws-being provided with one or more registering pins and holes arranged on such line of en agement.

3. photo- 111 clip, comprising a spring carrymg member, two jaws carried by said member,- and spring-pressed toward each other thereby, said two jaws being curved with their convex sides toward each other so that they engage substantially along a line, said two jaws being provided with one or more registering pins and holes.

4. A photo-film clip, comprising a spring carrying member, two jaws carried by said member and spring-pressed toward each other thereby, the face of said jaws toward each other being arranged so that the jaws engage each other substantially along a line and flare apart on opposite sides of such line, said two jaws belng provided with one or more registering pins and holes.

In witness whereof, we have hereunto set our hands at Indianapolis, Indiana, this 27th day of December, A. D. one thousand nine hundred and twenty.

LOUIS F. MoKELVEY. JOHN A. BRANDENBURGER. 

